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Use of naturally occurring system disturbances to estimate the fault current contribution of induction motors

The contribution of induction motor loads to short circuit currents can be significant and so must be considered when evaluating system fault levels. Standard procedures for calculating short circuit currents of induction motors require detailed machine data which may not be available. An algorithm has been developed to estimate the fault contribution of induction motor loads. The estimation technique is based on an analysis of load responses to naturally occurring disturbances. Neither disruptive staged tests or detailed information of the load or the network are required. The algorithm has been applied in practice by using the Fault Level Monitor, which records system disturbances. The fault infeed estimation algorithm has been examined using simulation studies and field tests. Results are presented which show good agreement between the values obtained from the algorithm and from conventional techniques.
Date January 1995
CreatorsWilliamson, G. E.
PublisherUniversity of Manchester
Source SetsEthos UK
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation

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